// Adapted from old version from http://stackwalker.codeplex.com/
// Newer version is now maintained at https://github.com/JochenKalmbach/StackWalker

/**********************************************************************
 * 
 * StackWalker.h
 *
 *
 * History:
 *  2005-07-27   v1    - First public release on http://www.codeproject.com/
 *  (for additional changes see History in 'StackWalker.cpp'!
 *
 **********************************************************************/

/**********************************************************************
 *
 * LICENSE (http://www.opensource.org/licenses/bsd-license.php)
 *
 *   Copyright (c) 2005-2013, Jochen Kalmbach
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without modification,
 *   are permitted provided that the following conditions are met:
 *
 *   Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *   Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *   Neither the name of Jochen Kalmbach nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 *   THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 *   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 **********************************************************************/

#ifndef MESH_PROCESSING_LIBHH_STACKWALKER_H_
#define MESH_PROCESSING_LIBHH_STACKWALKER_H_

#if defined(_MSC_VER)

#include <Windows.h>

namespace hh {

#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
#endif

// special defines for VC5/6 (if no actual PSDK is installed):
#if _MSC_VER < 1300
typedef unsigned __int64 DWORD64, *PDWORD64;
#if defined(_WIN64)
typedef unsigned __int64 SIZE_T, *PSIZE_T;
#else
typedef unsigned long SIZE_T, *PSIZE_T;
#endif
#endif  // _MSC_VER < 1300

class StackWalkerInternal;  // forward
class StackWalker {
 public:
  typedef enum StackWalkOptions {
    // No addition info will be retrieved
    // (only the address is available)
    RetrieveNone = 0,

    // Try to get the symbol-name
    RetrieveSymbol = 1,

    // Try to get the line for this symbol
    RetrieveLine = 2,

    // Try to retrieve the module-infos
    RetrieveModuleInfo = 4,

    // Also retrieve the version for the DLL/EXE
    RetrieveFileVersion = 8,

    // Contains all the above
    RetrieveVerbose = 0xF,

    // Generate a "good" symbol-search-path
    SymBuildPath = 0x10,

    // Also use the public Microsoft-Symbol-Server
    SymUseSymSrv = 0x20,

    // Contains all the above "Sym"-options
    SymAll = 0x30,

    // Contains all options (default)
    OptionsAll = 0x3F
  } StackWalkOptions;

  StackWalker(int options = OptionsAll,  // 'int' is by design, to combine the enum-flags
              LPCSTR szSymPath = nullptr, DWORD dwProcessId = GetCurrentProcessId(),
              HANDLE hProcess = GetCurrentProcess());
  StackWalker(DWORD dwProcessId, HANDLE hProcess);
  virtual ~StackWalker();

  typedef BOOL(__stdcall* PReadProcessMemoryRoutine)(
      HANDLE hProcess, DWORD64 qwBaseAddress, PVOID lpBuffer, DWORD nSize, LPDWORD lpNumberOfBytesRead,
      LPVOID pUserData  // optional data, which was passed in "ShowCallstack"
  );

  BOOL LoadModules();

  BOOL ShowCallstack(HANDLE hThread = GetCurrentThread(), const CONTEXT* context = nullptr,
                     PReadProcessMemoryRoutine readMemoryFunction = nullptr,
                     LPVOID pUserData = nullptr  // optional to identify some data in the 'readMemoryFunction'-callback
  );

#if _MSC_VER >= 1300
  // due to some reasons, the "STACKWALK_MAX_NAMELEN" must be declared as "public"
  // in older compilers in order to use it... starting with VC7 we can declare it as "protected"
 protected:
#endif
  enum { STACKWALK_MAX_NAMELEN = 1024 };  // max name length for found symbols

 protected:
  // Entry for each Callstack-Entry
  typedef struct CallstackEntry {
    DWORD64 offset;  // if 0, we have no valid entry
    CHAR name[STACKWALK_MAX_NAMELEN];
    CHAR undName[STACKWALK_MAX_NAMELEN];
    CHAR undFullName[STACKWALK_MAX_NAMELEN];
    DWORD64 offsetFromSmybol;
    DWORD offsetFromLine;
    DWORD lineNumber;
    CHAR lineFileName[STACKWALK_MAX_NAMELEN];
    DWORD symType;
    LPCSTR symTypeString;
    CHAR moduleName[STACKWALK_MAX_NAMELEN];
    DWORD64 baseOfImage;
    CHAR loadedImageName[STACKWALK_MAX_NAMELEN];
  } CallstackEntry;

  enum CallstackEntryType { firstEntry, nextEntry, lastEntry };

  virtual void OnSymInit(LPCSTR szSearchPath, DWORD symOptions, LPCSTR szUserName);
  virtual void OnLoadModule(LPCSTR img, LPCSTR mod, DWORD64 baseAddr, DWORD size, DWORD result, LPCSTR symType,
                            LPCSTR pdbName, ULONGLONG fileVersion);
  virtual void OnCallstackEntry(CallstackEntryType eType, CallstackEntry& entry);
  virtual void OnDbgHelpErr(LPCSTR szFuncName, DWORD gle, DWORD64 addr);
  virtual void OnOutput(LPCSTR buffer);

  StackWalkerInternal* m_sw;
  HANDLE m_hProcess;
  DWORD m_dwProcessId;
  BOOL m_modulesLoaded;
  LPSTR m_szSymPath;

  int m_options;

  static BOOL __stdcall myReadProcMem(HANDLE hProcess, DWORD64 qwBaseAddress, PVOID lpBuffer, DWORD nSize,
                                      LPDWORD lpNumberOfBytesRead);

  friend class StackWalkerInternal;
};

// The "ugly" assembler-implementation is needed for systems before XP
// If you have a new PSDK and you only compile for XP and later, then you can use
// the "RtlCaptureContext"
// Currently there is no define which determines the PSDK-Version...
// So we just use the compiler-version (and assumes that the PSDK is
// the one which was installed by the VS-IDE)

// INFO: If you want, you can use the RtlCaptureContext if you only target XP and later...
//       But I currently use it in x64/IA64 environments...
//#if defined(_M_IX86) && (_WIN32_WINNT <= 0x0500) && (_MSC_VER < 1400)

#if defined(_M_IX86)
#ifdef CURRENT_THREAD_VIA_EXCEPTION
// TODO: The following is not a "good" implementation,
// because the callstack is only valid in the "__except" block...
#define GET_CURRENT_CONTEXT(c, contextFlags)                                                                    \
  do {                                                                                                          \
    memset(&c, 0, sizeof(CONTEXT));                                                                             \
    EXCEPTION_POINTERS* pExp = nullptr;                                                                         \
    __try {                                                                                                     \
      throw 0;                                                                                                  \
    } __except (((pExp = GetExceptionInformation()) ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_EXECUTE_HANDLER)) { \
    }                                                                                                           \
    if (pExp != nullptr) memcpy(&c, pExp->ContextRecord, sizeof(CONTEXT));                                      \
    c.ContextFlags = contextFlags;                                                                              \
  } while (0);
#else
// The following should be enough for walking the callstack...
#define GET_CURRENT_CONTEXT(c, contextFlags)                                                      \
  do {                                                                                            \
    memset(&c, 0, sizeof(CONTEXT));                                                               \
    c.ContextFlags = contextFlags;                                                                \
    __asm call x __asm x : pop eax __asm mov c.Eip, eax __asm mov c.Ebp, ebp __asm mov c.Esp, esp \
  } while (0);
#endif

#else

// The following is defined for x86 (XP and higher), x64 and IA64:
#define GET_CURRENT_CONTEXT(c, contextFlags) \
  do {                                       \
    memset(&c, 0, sizeof(CONTEXT));          \
    c.ContextFlags = contextFlags;           \
    RtlCaptureContext(&c);                   \
  } while (0);
#endif

}  // namespace hh

#endif  // defined(_MSC_VER)

#endif  // MESH_PROCESSING_LIBHH_STACKWALKER_H_
